CVE-2026-9087
Keycloak: cross-session email verification proof not bound to upstream identity in first-broker-login
CVSS Score
6.4
EPSS Score
0.0%
EPSS Percentile
0th
A flaw was found in Keycloak. The cross-session verification proof is keyed only by (local userId, idpAlias) and is not bound to the upstream identity that was actually verified, so a second upstream account on the same IdP can consume it and get linked to the victim's local account.
| CWE | CWE-639 |
| Vendor | red hat |
| Product | red hat build of keycloak |
| Published | May 20, 2026 |
Stay Ahead of the Next One
Get instant alerts for red hat red hat build of keycloak
Be the first to know when new medium vulnerabilities affecting red hat red hat build of keycloak are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Affected Versions
Red Hat / Red Hat Build of Keycloak
All versions affected